If I select do not compile if the Stub compiler popup menu I get the following 
exception:

Thu Jun 21 11:56:11 CEST 2001: 
org.openide.explorer.propertysheet.PropertyDetails$ExceptionHack: 
java.lang.IllegalArgumentException
        at org.netbeans.modules.rmi.RMICompilerSupport.setStubCompilerType
(RMICompilerSupport.java:121)
        at org.netbeans.modules.rmi.RMICompilerSupport$1.setValue
(RMICompilerSupport.java:180)
        at org.openide.explorer.propertysheet.PropertyDetails.setPropertyValue
(PropertyDetails.java:185)
        at org.openide.explorer.propertysheet.PropertyDisplayer.setPropertyValue
(PropertyDisplayer.java:830)
        at org.openide.explorer.propertysheet.PropertyDisplayer.setAsText
(PropertyDisplayer.java:799)
        at 
org.openide.explorer.propertysheet.PropertyDisplayer$WriteComponentListener.chan
geValue(PropertyDisplayer.java:1088)
        at 
org.openide.explorer.propertysheet.PropertyDisplayer$WriteComponentListener.acti
onPerformed(PropertyDisplayer.java:1049)
        at javax.swing.JComboBox.fireActionEvent(JComboBox.java:870)
        at javax.swing.JComboBox.selectedItemChanged(JComboBox.java:894)
        at javax.swing.JComboBox.contentsChanged(JComboBox.java:950)
        at javax.swing.AbstractListModel.fireContentsChanged
(AbstractListModel.java:79)
        at javax.swing.DefaultComboBoxModel.setSelectedItem
(DefaultComboBoxModel.java:86)
        at javax.swing.JComboBox.setSelectedItem(JComboBox.java:415)
        at javax.swing.JComboBox.setSelectedIndex(JComboBox.java:455)
        at javax.swing.plaf.basic.BasicComboPopup$ListMouseHandler.mouseReleased
(BasicComboPopup.java:582)
[catch] at java.awt.AWTEventMulticaster.mouseReleased
(AWTEventMulticaster.java:231)
        at java.awt.Component.processMouseEvent(Component.java:3715)
        at java.awt.Component.processEvent(Component.java:3544)
        at java.awt.Container.processEvent(Container.java:1164)
        at java.awt.Component.dispatchEventImpl(Component.java:2593)
        at java.awt.Container.dispatchEventImpl(Container.java:1213)
        at java.awt.Component.dispatchEvent(Component.java:2497)
        at java.awt.LightweightDispatcher.retargetMouseEvent
(Container.java:2451)
        at java.awt.LightweightDispatcher.processMouseEvent(Container.java:2216)
        at java.awt.LightweightDispatcher.dispatchEvent(Container.java:2125)
        at java.awt.Container.dispatchEventImpl(Container.java:1200)
        at java.awt.Window.dispatchEventImpl(Window.java:914)
        at java.awt.Component.dispatchEvent(Component.java:2497)
        at java.awt.EventQueue.dispatchEvent(EventQueue.java:339)
        at java.awt.EventDispatchThread.pumpOneEventForHierarchy
(EventDispatchThread.java:131)
        at java.awt.EventDispatchThread.pumpEventsForHierarchy
(EventDispatchThread.java:98)
        at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:93)
        at java.awt.EventDispatchThread.run(EventDispatchThread.java:85)

I can reproduce this error.